A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 6610-01-217-4162
NSN 5999-00-573-5663
NSN 5996-01-356-2994
NSN 5965-00-849-1313
NSN 4140-01-415-1187
NSN 5990-00-892-5537
NSN 6145-01-317-7445
NSN 5990-01-476-8813
NSN 5945-01-486-3697
NSN 5999-00-751-1188
NSN 5920-01-020-7659
NSN 6320-01-160-7757